High · published November 27, 2025
CVSS calls it high at 8.8. It is confirmed in active exploitation. It sits in the 99.2th percentile for exploit probability.
Ray is an AI compute engine. Prior to version 2.52.0, developers working with Ray as a development tool can be exploited via a critical RCE vulnerability exploitable via Firefox and Safari. This vulnerability is due to an insufficient guard against browser-based attacks, as the current defense uses the User-Agent header starting with the string "Mozilla" as a defense mechanism. This defense is insufficient as the fetch specification allows the User-Agent header to be modified. Combined with a DNS rebinding attack against the browser, and this vulnerability is exploitable against a developer running Ray who inadvertently visits a malicious website, or is served a malicious advertisement (malvertising). This issue has been patched in version 2.52.0.
| Product | Versions | Fixed in |
|---|---|---|
| anyscale/ray | < 2.52.0 | 2.52.0 |